We just released security updates to Jenkins, versions 2.84 and 2.73.2, that fix several security vulnerabilities.
Additionally, we published a new release of Swarm Plugin whose client contains a security fix, and Maven Plugin 3.0 was recently released to resolve a security issue.
Users of Swarm Plugin and Maven Plugin should update these to their respective newest versions.

For an overview of what was fixed, see the security advisory.
For an overview on the possible impact of these changes on upgrading Jenkins LTS, see our LTS upgrade guide.

We also published information about a vulnerability in Speaks! Plugin.
There is no fix available and we recommend it be uninstalled.
Its distribution has been suspended.